Idony? I-don-know. It's a little out there. If my name is Idony, I might be jealous of my sister Laurel. It reminds me of Ebony and Ivory. The first two letters are striking to me. possible nickname:Id plus texters and young people use Idk and Idc all the time. (translation I don't know and I don't care.)
I would pronounce it like Ivory if I saw it somewhere. My advice:keeping looking, it's not awful, you could you use it. I dun know. It's up to you.

I agree that it sounds made up. I also personally don't find it to be a pretty sound - it is sort of clunky. If you do use it, make sure it goes with your last name and doesn't end up sounding like a sentence - "I don't eat ...." (much like the issues that can arise with Ida).